Technology

Technology is the sum of techniques, skills, methods, and processes used in the production of goods or services or in the accomplishment of objectives, such as scientific investigation. Technology can be the knowledge of techniques, processes, and the like, or it can be embedded in machines to allow for operation without detailed knowledge of their workings. Systems (e.g. machines) applying technology by taking an input, changing it according to the system's use, and then producing an outcome are referred to as technology systems or technological systems.

The simplest form of technology is the development and use of basic tools. The prehistoric discovery of how to control fire and the later Neolithic Revolution increased the available sources of food, and the invention of the wheel helped humans to travel in and control their environment. Developments in historic times, including the printing press, the telephone, and the Internet, have lessened physical barriers to communication and allowed humans to interact freely on a global scale.

Technology has many effects. It has helped develop more advanced economies (including today's global economy) and has allowed the rise of a leisure class. Many technological processes produce unwanted by-products known as pollution and deplete natural resources to the detriment of Earth's environment. Innovations have always influenced the values of a society and raised new questions in the ethics of technology. Examples include the rise of the notion of efficiency in terms of human productivity, and the challenges of bioethics.

Philosophical debates have arisen over the use of technology, with disagreements over whether technology improves the human condition or worsens it. Neo-Luddism, anarcho-primitivism, and similar reactionary movements criticize the pervasiveness of technology, arguing that it harms the environment and alienates people; proponents of ideologies such as transhumanism and techno-progressivism view continued technological progress as beneficial to society and the human condition.

Power Inverter

 A power inverter is used to maintain the flow of energy from DC to AC buses [17]. Both the initial capital cost and replacement cost of the inverter used in this study are assumed to be $950/kW with the negligible O&M costs. The efficiency of the inverter is assumed to be 90% and its lifetime to be 15 years. The size of the proposed power inverter may range from 0 to 20 kW."

                                                                            

            

Inverters and power electronics

Inverters and power electronics must be designed and manufactured specifically for fuel cell hybrids with the understanding that accepting input from both the heat engine and the fuel cell would be preferred. The integration of the inverter and power electronics with hybrid power plants is not well understood and has not been well investigated. The following inverter component studies would be useful in a hybrid fuel cell program:

•low-cost inverters;

•simplified inverters;

•inverter and power electronics systems analysis identifying cost, complexity, and trade-offs of various inverter architectures;

•inverter and power electronics systems analysis identifying cost, complexity, and trade-offs of using separate inverters for fuel cell and heat engine versus a single inverter;

•integration of inverter with system;

•effects of inverter and system architecture on power quality and reliability;

•inverter innovation to reduce the cost for lower power inverters; and

•inverter and power electronics robustness to match the expected low maintenance of hybrid system.